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Investments - Mortgage Loans (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Commercial mortgage loans |  |  |
Mortgage loan disclosures |  |  |
Mortgage loans, purchased | $ 126.7 | $ 109.2 | $ 325.4
Mortgage loans, sold | 148.1 | 12.1 | 15.6
Mortgage loans, Total amortized cost | $ 17,072.7 | $ 16,581.8 |
Percent of mortgage loans (as a percent) | 100.00% | 100.00% |
Commercial mortgage loans | Office |  |  |
Mortgage loan disclosures |  |  |
Mortgage loans, Total amortized cost | $ 3,182.9 | $ 3,643.0 |
Percent of mortgage loans (as a percent) | 18.50% | 21.90% |
Commercial mortgage loans | Retail |  |  |
Mortgage loan disclosures |  |  |
Mortgage loans, Total amortized cost | $ 1,476.9 | $ 1,454.7 |
Percent of mortgage loans (as a percent) | 8.70% | 8.80% |
Commercial mortgage loans | Industrial |  |  |
Mortgage loan disclosures |  |  |
Mortgage loans, Total amortized cost | $ 4,364.5 | $ 3,515.7 |
Percent of mortgage loans (as a percent) | 25.60% | 21.20% |
Commercial mortgage loans | Apartments |  |  |
Mortgage loan disclosures |  |  |
Mortgage loans, Total amortized cost | $ 7,220.4 | $ 7,128.2 |
Percent of mortgage loans (as a percent) | 42.30% | 43.00% |
Commercial mortgage loans | Hotel |  |  |
Mortgage loan disclosures |  |  |
Mortgage loans, Total amortized cost | $ 65.0 | $ 68.6 |
Percent of mortgage loans (as a percent) | 0.40% | 0.40% |
Commercial mortgage loans | Mixed use/other |  |  |
Mortgage loan disclosures |  |  |
Mortgage loans, Total amortized cost | $ 763.0 | $ 771.6 |
Percent of mortgage loans (as a percent) | 4.50% | 4.70% |
Commercial mortgage loans | New England |  |  |
Mortgage loan disclosures |  |  |
Mortgage loans, Total amortized cost | $ 347.2 | $ 366.5 |
Percent of mortgage loans (as a percent) | 2.00% | 2.20% |
Commercial mortgage loans | Middle Atlantic |  |  |
Mortgage loan disclosures |  |  |
Mortgage loans, Total amortized cost | $ 4,714.9 | $ 4,512.6 |
Percent of mortgage loans (as a percent) | 27.70% | 27.10% |
Commercial mortgage loans | East North Central |  |  |
Mortgage loan disclosures |  |  |
Mortgage loans, Total amortized cost | $ 591.0 | $ 583.3 |
Percent of mortgage loans (as a percent) | 3.50% | 3.50% |
Commercial mortgage loans | West North Central |  |  |
Mortgage loan disclosures |  |  |
Mortgage loans, Total amortized cost | $ 394.0 | $ 336.0 |
Percent of mortgage loans (as a percent) | 2.30% | 2.00% |
Commercial mortgage loans | South Atlantic |  |  |
Mortgage loan disclosures |  |  |
Mortgage loans, Total amortized cost | $ 2,987.7 | $ 2,761.9 |
Percent of mortgage loans (as a percent) | 17.50% | 16.70% |
Commercial mortgage loans | East South Central |  |  |
Mortgage loan disclosures |  |  |
Mortgage loans, Total amortized cost | $ 417.7 | $ 429.4 |
Percent of mortgage loans (as a percent) | 2.40% | 2.60% |
Commercial mortgage loans | West South Central |  |  |
Mortgage loan disclosures |  |  |
Mortgage loans, Total amortized cost | $ 1,310.5 | $ 1,268.6 |
Percent of mortgage loans (as a percent) | 7.70% | 7.70% |
Commercial mortgage loans | Mountain |  |  |
Mortgage loan disclosures |  |  |
Mortgage loans, Total amortized cost | $ 979.5 | $ 824.2 |
Percent of mortgage loans (as a percent) | 5.70% | 5.00% |
Commercial mortgage loans | Pacific |  |  |
Mortgage loan disclosures |  |  |
Mortgage loans, Total amortized cost | $ 4,851.9 | $ 4,974.4 |
Percent of mortgage loans (as a percent) | 28.40% | 30.00% |
Commercial mortgage loans | International |  |  |
Mortgage loan disclosures |  |  |
Mortgage loans, Total amortized cost | $ 478.3 | $ 524.9 |
Percent of mortgage loans (as a percent) | 2.80% | 3.20% |
Residential mortgage loans |  |  |
Mortgage loan disclosures |  |  |
Mortgage loans, purchased | $ 382.6 | $ 554.7 | 1,846.0
Mortgage loans, sold | 29.1 | 115.9 | $ 535.7
Mortgage loans, Total amortized cost | $ 3,607.4 | $ 3,696.5 |

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